Improvement in automatic gate



E. HARTER. y

Automatic Gate.

No. 82,83%. f. A yPatented Oct.' 6, 1868".Y

N- PETERS, PNOTO-LITHOGRAPNER. WASHSGTDN, D. CV

ELAM HARTER,'0Fv DowAeiAo, MICHIGAN;

Letters .Patent No. 82,831, dated *October 6, 1868.

IMPROVEMENT IN AUTOMATIC GATE.

ilge'tlgehule rifiutata in tigen Entert tatentanh mating part nf the same.

ToA ALL WHoM Ir MAY coNcnnN;

Be it lmown that I, ELAM HARTER, of Dowagiac', in the county of Cass, and State of Michigan, have invented a new and useful Improvement in Automatic Gates; and I do herebydeclare that the following is a full, clear, and exact description thereof, reference being had to the vaccompanying drawings, and the letters of reference marked thereon. I 1

Figure 1 is a front elevation of the double gate.

Figure 2 is a top view of the same, one of the-gates being' removed. t v

Figure 3 is a side view of one of the sills, between which the platforms are located, with the lockingmechanism attached. Y v

A is the gate,-and B is an inclined bar, upon which the gate rides, running upon truck-wheels, a a', attached to the gate. Said inclined bar Bis mounted upon two fixed posts, B1 B2: Two friction-wheels, b b', are also attached to the gate, below the inclined bar B. C is a bent or angular lever, turning on a fulcrum, c, attached.

to the ixed post B. D is another lever, turning upon a fulcrum, d, to the inner end of which a cross-sill, E,

is suspended, by means of a link or stirrup, e. Said cross-sill E supports one end of a vibratingoor or plat- Yorin, E', over which ilehic'les must pass in going through the gate. The levers C and D are connected, at the top and bottom, by"means of chains-F and F', said chain F being also attached to the gate at f. Said iioo'r or platform E oscillates upon a shaft at the rear end, G. l

It will be seen that, when a vehicle,or any other suiiicient weight, presses Aupon said platform, to depress its inner end, the outer end of the lever'D will rise, drawing inward the chain F, which, acting upon the lower end of levei` C, will throw the upper end oi' said lever outward, causing the chain F, which is attached to the gate, to draw outward, carrying the gate up the inclined bar B, and out of the roadway.

When the pressure upon the platform is removed, the gate will run down the inclined bar B, by the force .of gravitation, tillvit meets the corresponding gate on the other side, in the centre ot the roadway. v

To obviate all danger of the gates being opened by loose animals stepping upon the platform, I have provided a lock, which I will now proceed to describe.

The platform is placed between two sills, H and H. To the side of one of these sills, H, islattachedia lever, h, turning upon a fulcrum, t. The inner end of said lever z. supports the outer end of another lever, I, turning upon its fulcrum, z', and the inner end of' said -lever I bears down upon the inner end of a springlever, J, lying at right angles thereto, under the gate. The front end of said spring-lever J is forked, and, when not depressed, embraces a pin projecting from the lower side ofthe bottom sill ofthe gate, and thus locks the gate, and prevents itfr'ommoving outward. From the rear end of lever projects, at right yangles, and in a horizontal position, an arm, c, which lies a little above the rear end of the platform.

When a vehicle approaches the gate, the wheels, in passing over said arm 75, will depress the back end of the lever 7L, which, acting upon said lever I, will'cause its inner end to be depressed, bearing down the inner end of the spring-lever J, so that its fork will clear the pin projecting fromthe gate-sill, thus unlocking the gate, and allowing it to be carried outward, by means of the pressure on the platform, as before described.

The operation upon the opposi'tegate will be precisely the same as here described, so that th two gates will approach andlrecede fromeach other simultaneously.

What I claim as my'iuvention, and desire to secure by Letters Patent, isl 1. The combination ofthe gate, truck-wheels, inclined bars or rails, and vibrating platform, with the levers and chains, (or equivalents of the 1atter,) by means ofv which, pressure upon the platform causes the gates to r-un asunder on the inclined rails, substantially as described.

2. The mechanism, herein described, for locking and unlocking the gate, substantially as shown and described.

j ELAM' HARTER.

i Witnesses:

Jos. L. CooMBs, J. J. CooMBs. 

